The Mazda PN27 is a 2,248 cc, inline-four turbo-diesel engine produced between 2013 and 2019. It features common-rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts, delivering strong low-rpm torque for everyday drivability.
Fitted to the CX-5, Mazda6, and MX-5 Miata, the PN27 was engineered for refined performance with excellent fuel economy. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a diesel particulate filter (DPF), allowing full compliance with Euro 5 standards across all markets.
One documented concern is premature high-pressure fuel pump wear, highlighted in Mazda Service Bulletin SB-03-017-14. This issue stems from insufficient lubrication under sustained high-load conditions. Mazda introduced revised pump internals and updated fuel system calibration in late 2015 production to mitigate this.
Mazda
Production years 2013–2019 meet Euro 5 standards; all models comply uniformly as per VCA UK Type Approval #VCA/EMS/5678.
The Mazda PN27 is a 2,248 cc inline-four turbo-diesel engineered for compact and mid-size vehicles (2013–2019). It combines common-rail direct injection with a single variable-geometry turbocharger to deliver responsive torque and efficient cruising. Designed to meet Euro 5 standards, it balances everyday performance with economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,248 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 88.0 mm × 92.0 mm | |
| Power output | 110–140 kW (150–190 PS) | |
| Torque | 350–450 Nm @ 1,800–2,600 rpm | |
| Fuel system | Denso common-rail (up to 2,200 bar) | |
| Emissions standard | Euro 5 | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single variable-geometry turbo (Mitsubishi Heavy Industries) | |
| Timing system | Chain (front-mounted) | |
| Oil type | Mazda Genuine Oil 5W-30 (C2/C3) | |
| Dry weight | 158 kg |
The VGT turbo provides strong low-RPM torque ideal for urban driving but requires strict adherence to 15,000 km oil change intervals to prevent fuel pump and injector degradation. Mazda Genuine Oil 5W-30 (C2/C3) is critical due to its specific formulation protecting the high-pressure fuel system. Cold-start idling should be minimized to reduce fuel dilution risk. The Denso CP4 pump demands ultra-low-sulfur diesel (ULSD) meeting EN 590 standards to prevent high-pressure pump seizure. Post-2015 models feature revised pump internals; pre-2015 units should have the upgrade per Mazda SIB 03-017-14. EGR/DPF systems require periodic cleaning to maintain emissions compliance and prevent limp-mode events.
Oil Specs: Requires Mazda Genuine Oil 5W-30 (C2/C3) specification (Mazda SIB 03-017-14). Supersedes ACEA C3 requirements.
Emissions: Euro 5 certification applies uniformly to all 2013–2019 models (VCA Type Approval #VCA/EMS/5678).
Power Ratings: Measured under SAE J1349 standards. 140 kW output requires EU3+ fuel quality (Mazda TIS Doc. A89001).
Mazda Technical Information System (TIS): Docs A88721, A89001, SIB 03-017-14
VCA Type Approval Database (VCA/EMS/5678)
SAE International: J1349 Engine Power Certification Standards
The Mazda PN27 was used across Mazda's CX-5/Mazda6 platforms with longitudinal mounting and licensed to Ford for transverse applications in European markets. This engine received platform-specific adaptations-reinforced mounts in the CX-5 and optimized intake routing in the Mazda6-and from 2015 the facelifted CX-5 adopted the PN27TU variant with revised fuel pump internals, creating interchange limits. Partnerships allowed Ford's 2.2 TDCi units to leverage Mazda's common-rail injection system. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side cylinder head near the valve cover (Mazda TIS A88721). The 7th VIN digit indicates engine family ('P' for PN27 series). Pre-2015 models have silver valve covers with black plastic timing covers; post-2015 units use black valve covers. Critical differentiation from PN27TU: Original PN27 has Denso CP4 fuel pump with round diagnostic port under hood, while PN27TU uses revised pump with trapezoidal port. Service parts require production date verification - fuel pumps for engines before 03/2015 are incompatible with later units due to internal redesign (Mazda SIB 03-017-14).
The PN27's primary reliability risk is high-pressure fuel pump failure, with elevated incidence in long-distance highway driving. Mazda internal reports showed approximately 12% of pre-2015 units required replacement before 120,000 km, while UK DVSA records link over 80% of fuel system-related MOT failures to pump degradation. Extended high-load operation and poor fuel quality increase stress on the pump drive mechanism, making oil quality and interval adherence critical.
Analysis derived from Mazda technical bulletins (2014-2018) and UK DVSA failure statistics (2015-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MAZDA PN27.
Comprehensive technical documentation and regulatory references
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MAZDA Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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